rrdtool graph test.png -F -E --height=100 --width=500 --vertical-label=pages \
"DEF:MSSQL_Free_Pages-raw=MSSQL Free Pages_MSSQL Free Pages.rrd:ds0:AVERAGE" \
CDEF:MSSQL_Free_Pages=MSSQL_Free_Pages-raw \
LINE:MSSQL_Free_Pages-raw#00cc00:MSSQL Free Pages \
GPRINT:MSSQL_Free_Pages-raw:LAST:cur:%5.2lf%s \
GPRINT:MSSQL_Free_Pages-raw:AVERAGE:avg:%5.2lf%s \
GPRINT:MSSQL_Free_Pages-raw:MAX:max:%5.2lf%s